all right, john. thank you so much. >>> for more on the why, we're joined from washington, by former chief psychologist for the secret service, dr. marisa randazzo. and dr. randazzo, you say it is key what he told his mother, quote, if anything happens to me, the government may be involved. you say that kind of paranoia could be a clue to what was motivating him? >> absolutely. there's so much we don't know about this case yet. and we're going to be learning as the investigation unfolds. but we've got two big clues here, with what the mother and what his aunt shared with newspapers about the paranoia, about the sense that if anything happens to me, the government is to blame. this suggests he may have been experiencing what we call a break with reality, which may indicate some developing mental disorder, like a psychosis. >> most people that develop these delusions do so in their teens or early 20s. but severe life stress can cause somebody later in life, like this man, in his early 40s, to also devel